If there's no danger of it causing damage to the hull, let it swing... it should simply 'follow the flow' At sea it would be difficult to do anything with it in any event.
Last thing you want, though, is for it to jam hard to one side or the other... could be a tough situation.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)